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The elements X and Y form a compound that is 66.67% X and 33.33% Y by mass. The atomic mass of X is twice that of Y. What's the empirical formula?
A planar electromagnetic wave is propagating in the +x direction. What is the Poynting vector at the point P at that instant
A Volume of 211 mL of H is collected over water, the water level in the collecting vessel is the same as the outside level. Atm Pressure is 756 Torr and the temp is 25 degree C. Calculate atomic mas
If the standard heat of rxn for the rxn is calculated to be -567.4 kJ/g mol FeS2(s) what is the value of Delta Hrxn will you use per kg of FeS2 burned in an energy balance
The decomposition of nitric oxide NO to N2 and O2 is second order with a rate constant of 0.0796 M^-1 S^-1 at 737 C and 0.0815 M^-1 S^-1 at 947 C. Calculate the activation energy.
For the elementary process N2O5 (g) = NO2(g) + NO3 (g) the activation energy (Ea) and overall Delta E are 154 KJ/mol, and 136 KJ/mol, respectively. What is the activation energy of the reverse react
Compare the rms speeds. Compare the average kinetic energy. -Consider equimolar samples of the same ideal gas at the same temperature, but different volumes. Sample A has a larger volume than Sample
A cylinder contains a piston on each side of which is one kilomole of an ideal gas. The walls of the cylinder are diathermal, compute the change in the Helmholtz potential
A 4 kg dog stands on one end of a 20 kg boat. The dog is initially 6 m from the shore, How far has the boat moved after the dog has walked the 2m
A gas mixture is made by combining 7.2g each of Ar, Ne, and an unknown diatomic gas. At STP, the mixture occupies a volume of 92.04L. What is the molar mass of the unknown gas in g/mol, and identify
Consider two capacitors in air each with a capacitance C, both capacitors then were filled with liquid having a dielectric constant k, What is produced heat
The activation energy of a certain reaction is 32.3kJ/mol . At 20 degrees C, the rate constant is 0.0130s^-1. At what temperature would this reaction go twice as fast? The equation that is given is
A textbook of mass 1.90kg rests on a frictionless, horizontal surface. A cord attached to the book passes over a pulley whose diameter is 0.150m, What is the tension in the part of the cord attached
Consider the formation of nitryl fluoride: 2NO2+F2=2NO2 the reaction is first order in F2 and second order overall. what is the rate law
At an intersection of hospital hallways, a convex mirror is mounted high on a wall to help people avoid collisions. Using a scales 3-ray diagram, locate and describe the image of a patient 10.0 m from
Consider the reaction: 2H3PO4=P2O5+3H20 Using the information below calculate the average rate of formation of P2O5 between 10.0 and 40.0 seconds.
What is the energy range (in joules) of photons of wavelength 400nm to 760nm
What is the empirical formula of a hydrocarbon if complete combustion or 1.900 mg of the hydrocarbon produced 6.423 mg of CO2 and 1.315 mg of H2O? Be sure to write C first in the formula.
Object O1 is 15.0 cm to the left of a converging lens of 10.0-cm focal length. A second lens is positioned 10.0 cm to the right of the first lens, What is the focal length of the second lens
A swimming pool has dimensions 24.0 m x 11.0 m and a flat bottom. The pool is filled to a depth of 2.10 m with fresh water. What is the force exerted by the water at the bottom
The complete combustion of pentane releases 243 kj on the basis of this information calculate the value of delta H for the complete combustion of one mole of pentane
A particular method is to be used to analyze an ore that contains 4.8% copper. What minimum sample weight should be taken if the relative error due to a 0.5 mg loss is to be smaller than .1%
most scientists agree that the earth is 4.5 billion years old. 50 years from noe, how many sig figs will we record in the age of the earth
Match the following properties of liquids to what they indicate about the relative strength of the intermolecular forces in that liquid. Strong intermolecular forces: Weak intermolecular forces